Tutorial by Examples: d

You can use extensions for reference View, no more boilerplate after you created the views. Original Idea is by Anko Library Extensions inline fun <reified T : View> View.find(id: Int): T = findViewById(id) as T inline fun <reified T : View> Activity.find(id: Int): T = findViewById(i...

OpenCv image read from file system in Java import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.imgcodecs.Imgcodecs; public class Giris { public static void main(String[] args) { //Load native library System.loadLibrary(Core.NATIVE_LIBRARY_NAME...

Getters and setters are methods that are behaved like properties. it means they have function structure but when used, they are used same as properties: Structure of getter functions: they should have get keyword after function keyword and before function name, with no argument, a return type spec...

This is an example how to get the play an audio file which you already have on your pc/laptop .First create a new directory under res and name it as raw like this copy the audio which you want to play into this folder .It may be a .mp3 or .wav file. Now for example on button click you want to pl...

Numpy provides a cross function for computing vector cross products. The cross product of vectors [1, 0, 0] and [0, 1, 0] is [0, 0, 1]. Numpy tells us: >>> a = np.array([1, 0, 0]) >>> b = np.array([0, 1, 0]) >>> np.cross(a, b) array([0, 0, 1]) as expected. While cr...

Either input can be an array of 3- (or 2-) element vectors. >>> a=np.array([[1,0,0],[0,1,0],[0,0,1]]) >>> b=np.array([1,0,0]) >>> np.cross(a,b) array([[ 0, 0, 0], [ 0, 0, -1], [ 0, 1, 0]]) The result in this case is array([np.cross(a[0],b), np.c...

The default requests integrated in volley don't allow to pass a JSONArray as request body in a POST request. Instead, you can only pass a JSON object as a parameter. However, instead of passing a JSON object as a parameter to the request constructor, you need to override the getBody() method of the...

Float data type The float data type is a single-precision 32-bit IEEE 754 floating point. Float overflow Maximum possible value is 3.4028235e+38 , When it exceeds this value it produces Infinity float f = 3.4e38f; float result = f*2; System.out.println(result); //Infinity Float Und...

We may forget to apply the Antiforgery attribute for each POST request so we should make it by default. This sample will make sure Antiforgery filter will always be applied to every POST request. Firstly create new AntiForgeryTokenFilter filter: //This will add ValidateAntiForgeryToken Attribute t...

Traversing from the root node to a descendant element using the child axis: /child::html/child::body/child::div/child::span Since the child axis is the default axis, this can be abbreviated to: /html/body/div/span

The descendant and descendant-or-self axes can be used to find all descendant elements of a node at any depth. In contrast, the child axis only traverses immediate children. /child::html/descendant::span /child::html/descendant-or-self::* The double slash // is a shortcut for /descendant-or-sel...

The following-sibling and preceding-sibling axes contain the siblings before or after the context node, and the following and preceding axes contain all nodes in the document before or after the context node, but: None of these axes contain attribute or namespace nodes. The following axis doesn'...

The attribute and namespace axes contain all attribute and namespace nodes of an element. The shortcut @ stands for attribute::, so the following are equivalent: child::div/attribute::class div/@class

Why do we need this? The current way to do unit testing in Xamarin.Forms is via a platform runner, so your test will have to run within an ios, android, windows or mac UI environment : Running Tests in the IDE Xamarin also provides awesome UI testing with the Xamarin.TestCloud offering, but when ...

To add to the first example, in order to test navigation statements that occurs within the application, we need to provide the ViewModel with a hook to the Navigation. To achieve this: Add the package SpecFlow.Xamarin.Forms.IViewModel from nuget to your PCL Xamarin.Forms project Implement the IV...

Bootstrap uses a Grid System having rows and columns In the Grid system, you are using a row class to create a horizontal box with a total of 12 columns of size 1 unit each for different screen size vertically. If you do not want to use all 12 columns individually, you can group the columns togeth...

First, there is a really nice wrapper for setting up n on your system. Just run: curl -L https://git.io/n-install | bash to install n. Then install binaries in a variety of ways: latest n latest stable n stable lts n lts Any other version n <version> e.g. n 4.4.7 If this version ...

const options = require("commander"); options .option("-v, --verbose", "Be verbose"); options .command("convert") .alias("c") .description("Converts input file to output file") .option("-i, --in-file <file_name&...

Memoizing is basically a way to cache method results. This can be useful when a method is often called with the same arguments and the calculation of the result takes time, therefore increasing performance. Starting from Groovy 2.2, methods can be annoted with the @Memoized annotation. Imagine the...

Step 1: Create a bluemix account Create an account at https://console.ng.bluemix.net/registration/ This will set you up with a 30 day trial. You don't have to pay anything for the free resources and you don't have to set up billing until the end of your trial (though not all services will be avail...